Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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in thoſe very great ones which ſundry accidents continually
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duce. </
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<
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>And all this hath been ſpoken and granted on good grounds
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to
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Simplicius,
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and only with an intent to advertiſe him how much
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it importeth to be cautious in granting many experiments for true
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to thoſe who never had tried them, but only eagerly alledged them
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juſt as they ought to be for the ſerving their purpoſe: This is
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ken, I ſay, by way of ſurpluſſage and Corollary to
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Simplicius,
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for
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the real truth is, that as concerning theſe ſhots, the ſame ought
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actly to befall aſwell in the motion as in the reſt of the Terreſtrial
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Globe; as likewiſe it will happen in all the other experiments
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that either have been or can be produced, which have at firſt bluſh
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ſo mnch ſemblance of truth, as the antiquated opinion of the
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Earths motion hath of equivocation.</
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It is requiſite to
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be very cautious in
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admitting
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ments for true, to
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thoſe who never
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tried them.
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Experiments and
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arguments againſt
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the Earths motion
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ſeem ſo far
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cluding, as they lie
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hid under
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vokes.
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>SAGR. </
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>As for my part I am fully ſatisfied, and very well
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derſtand that who ſo ſhall imprint in his fancy this general
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munity of the diurnal converſion amongſt all things Terreſtrial,
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to all which it naturally agreeth, aſwell as in the old conceit of its
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reſt about the centre, ſhall doubtleſſe diſcern the fallacy and
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voke which made the arguments produced ſeem eoncluding.
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>There yet remains in me ſome hæſitancy (as I have hinted
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fore) touching the flight of birds; the which having as it were an
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animate faculty of moving at their pleaſure with a thouſand
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tions, and to ſtay long in the Air ſeparated from the Earth, and
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therein with moſt irregular windings to go fluttering to and again,
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I cannot conceive how amongſt ſo great a confuſion of motions,
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they ſhould be able to retain the firſt commune motion; and in
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what manner, having once made any ſtay behind, they can get
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it up again, and overtake the ſame with flying, and kcep pace
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with the Towers and trees which hurry with ſo precipitant a courſe
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towards the Eaſt; I ſay ſo precipitant, for in the great circle of
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the Globe it is little leſſe than a thouſand miles an hour, whereof
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the flight of the ſwallow I believe makes not fifty.</
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<
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>SALV. </
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>If the birds were to keep pace with the courſe of the
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trees by help of their wings, they would oſ neceſſity flie very faſt;
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and if they were deprived of the univerſal converſion, they would
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lag as far behind; and their flight would ſeem as furious towards
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the Weſt, and to him that could diſcern the ſame, it would
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much exceed the flight of an arrow; but I think we could not be
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able to perceive it, no more than we ſee a Canon bullet, whil'ſt
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driven by the fury of the fire, it flieth through the Air: But the
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truth is that the proper motion of birds, I mean of their flight,
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hath nothing to do with the univerſal motion, to which it is
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ther an help, nor an hinderance; and that which maintaineth
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the ſaid motion unaltered in the birds, is the Air it ſelf, thorough
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which they flie, which naturally following the
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Vertigo
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of the </
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